What mean the symbol ">" on CSS? like nav > ul >li {stuff}}

HTML-CSS
#1

Hello dears!

I’m on lesson 44 of Learn Accessibility. I completed the test but many lessons ago I have the same question.

What’s the difference between:

nav ul il{
   color: #dfdfe2;
   margin: 0 0.2rem;
   padding: 0.2rem;
   display: block;
}

and

nav > ul > il{
   color: #dfdfe2;
   margin: 0 0.2rem;
   padding: 0.2rem;
   display: block;
}

And how can I used correctly. Thank you

#2

I finded my own answer: